The environment and air is highly polluted because of exhaust emission from automobiles, so the need of the hour is to reduce the exhaust emission. Hence our investigation is to reduce the emission there by controlling the air pollution and to save the environment for happy utilization of the future generation. The experiments were conducted with various blends of diesel and biodiesel, with and without nano particles at different loads and proportions. Our investigation results revealed that the addition of aluminum oxide reduces exhaust emission significantly and also improves complete combustion.